Abstract

Careful design of the current-measuring amplifier circuit appears crucial for meaningful faradaic and double-layer charging responses to be obtained in cyclic voltammetry at ultramicroelectrodes for scan rates in the MV s −1 scan rate range. A step-by-step analysis of the system in the absence of a faradaic process reveals large deleterious effects of stray capacitances in addition to the intrinsic bandpass limitations of the current-measuring amplifier. Large oscillations ensue which distort the current response significantly. As a remedy, the introduction of a stabilizing capacitance in between the input and output of the amplifier is investigated. As shown by complete simulation of the current responses, proper adjustment of the stabilizing capacitance allows one to eliminate the distortion, the remaining effect being a small and correctable shift of the potential scale, up to scan rates of the order of 2 MV s −1.

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